Image sizing is a tricky issue. When ebooks started to become a more mainstream thing, image size in the file was limited by the vendors, and also we sometimes

Image sizing is a tricky issue. When ebooks started to become a more mainstream thing, image size in the file was limited by the vendors, and also we sometimes had third-party licensing restrictions. Over time, of course, devices got more memory and higher-resolution screen, so larger file sizes are allowed, or even desirable. However, consistent behavior is still elusive. And that's even assuming optimal coding on the part of the publisher or whoever is doing their conversions; they may be using files that are not adequate for the higer-res screens.